Twisting of yarns, threads, or filaments



May 23, 1933. w. POOL` TWISTING 0F YARNS, THREADS, OR FILAMENTS Filed 001'.. 30, 1931 llullllllll Ill VVILUAM POOL NVEN TOR ATTORN t V Patented May za, 1933 j UNITED STATES mmm rooL, or sronnou, 1mm nanny. ENGLAND.' Assieuon. 'ro cmNEsE connounou or Amies, n oonronarron or DELAWARE PATENT ori-ics TWISTING 0! YABNS, THBEADS. 0R FILAMENTS Application med October 30, 1931, Serial lo 571,970, and in Great Britain. December 24, 1980.

This invention relates .to the twisting of yarns, threads, or filaments (generally referred to hereafter as threads) and in particular to twisting by means of ldevices ada ted to impart more t an one turn of twist or each revolution imparted to the device.

In such devices, the package from which the thread is to be wound does not partake of the revolution of the twisting device. The thread is drawn off. the package'a'nd made to form a loop which is carried round the package itself by the rotation applied to the device. Assuming the package to be stationary, two turns of twist are .imparted for each revolution of the loop about the package. Rotation of the package itself in a direction opposite to that of the loop enables a higher rate of twisting to be obtained for the same rate of revolution applied to the'device.

According to the invention, a device of this character is employed to impart twist to two threadssimultaneously, the two threads being drawn from a single package and led separately therefrom for each to be twisted to a larger number of turns than that imparted to thedevice.

. Conveniently, the twistn is carried out -by ineansof a vdevice having tuular flyers as described in U. S. application S. No. 571,97 2 filed October 30, 1931, the threads passing from theirpackage Ithrough separate arms of the flyer and out of the device at opposite` ends, but any other twisting device, enabling the threads to follow separate paths and to be led away at opposite ends may be used. In

' this manner, both threads are twisted to the out excessive tension.

` same degree but in opposite senses.

In order to lead ,he two threads from' the device, the device has a hollow spindle at each end, the flyers being connected `to these spindles in such'a manner thatthe threads can be drawn through the spindles and ilyers with- Each spindle may be mounted'in ball or `other bearings, or the flyers may be made sufficiently strong to carry one spindle without the provision of -a bearing for that spindle. The device is driven by means such as belt or other gearing or an electric motor coupled to.

the spindle. The package may be held stationary, or; substantially vso, 4by. friction wheels carried bodily round by the driven spindle and engaging respectively a race on.

tionary where the device is arranged with a vertical or substantially vertical axis, since in A this ease gravity cannotbe utilized for this purpose as in devices having horizontal or substantially horizontal axes.

The .threads on the single package may be l already twistedjthreads, each of which can thus be given further twist. The invention las4 is, however,k particularly useful in enabling a thread of\'cgiitinuous filaments` (e. g. of

ycellulose acetate, viscose, or otherl artilicial silk, Aor natural silk) to be divided into two equal or-'unequal groups of filaments, each group then being twisted. Such thread preferably consists of untwisted filaments in order to make unnecessary the provision of untwi'sting means to enable the filaments to be separated ready for the retwisting.

` The twisted threads may -be collected by simple Winding, preferablyl on separate packages, or may be further twisted, or doubled with other threads, by means yof a suitable twisting device, such as a ring spindle. The

degree of twist applied by the device depends,

of course, on the rate of take-up and the rate `of twisting, andmay vary from low to high or very high according to the pu ose to which the threads are to be put. If esired, the degree of -twist may be caused to vary along the length of the thread by taking up the thread at an intermittent rate. Devices for this purpose are described for example in U'. S. application S. No. 538,486, filed May 19th, 1931. p

The invention'will now be described in greater Idetail with reference to the accompanying drawing, but it is to be understood that this description is given by way of ex? ample only, and is in no respect limitative.

Figure 1 shows a sectional elevation of the d evice for carrying out the twisting.,opera.` t1on according to the invention, the section ,be-vl ing taken along lines 1-1 of Figure 2.

' Figure 2 is a plan view ofthedeviceshown in Figure 1. i Figure 3 is a dia rammatic viewlshowing thai lay-out of the evice shown in Figure 1,

Figure 4 shows an alternate form-of spindle driving device.

ther hollow spindle 14. The spindle 14 is mounted in ball bearings 15 and is driven by means of a whorl 16. A short spindle 18 is supported by ball bearings 17 in the enlarged portion 13 of the spindle 14, the spindle 18 being parallel tothe axis of the spindle 14, and having gears 19, 2O fixed to its upper and lower vends respectively.

The gear 19 meshes with a further' gear 21 attached to the spindle l1 carrying the plat-v form 10, while the gear 2Ol at the lower end of the spindle 18 meshes with a gear 22, rigidly fixed to the frame of the device. The

A gears 19 and 2O being of the same size, and

the gears 21 and 22 being also of the same size, the rotation of the spindle 17 about the axis of the spindle 14 causes the gear 21 to' remain stationary like the gear 22, with the result that the platform 10 and the package 6 are held stationary, and are not permitted to rotate with the spindle 14. -The frame of the device to which the gear 22 is fixed rises in a flange 25 to enclose the gears 20, 22 and in a similar manner the enlarged portion 13 of the spindle 14 rises in a flange26 toenclose the gears 19 and 21.

The enlarged portion 13 of the spindle 14,

also carries two flyer tubes 27,27', communi-,3 cating with the hollow interior of theenlarged portion 13, the flyers passing out of the portion 13 from points lying at right angles to the points at which the spindles "18 are carried. For this reason the flyer 27 fon l the left of Figure 1 is shownin dotted lines', since this flyer is not actually cut by the sectional lines 1-1 of Figure 2. The flyers 27, 27 meet over the spindle in a connecting piece 2 8 mounted through ball bearings 29 in a tubular 'member 30 attached to thetop rail 31 of the twisting device. v The threads 7, 8 leave the package 6 in opposite directions, the thread 7 ,rising to the connecting piece 28 and being passed down the' flyer member 27 into the hollow interior of the enlarged portion 13, and thence down package 33. In' this manner the two loopsof thread 34, 35 contained in the flyers 27,

527 follow entirely independent paths and rotate round the stationaryy package 6, as they are drawn therefrom.

` F igureA 3 shows lthelay-out of the whole device, the threads 7, 8 leaving the opposite ends of vthe twisting device being passed through stationary, guides 37 to traversing guides 38 bymeans of which they are led to take-up bobbins 32, 33. The bobbins 32, 33 are mounted in slotted bearings 39, and are driven'by means offrictional rollers 40, engaging with the yarn of the packages 32, 33, so that the yarn isdrawn from the package 6 at a constant rate, and collected on the packages 32, 33. A driving belt 41 engaging w,ith the whorl 16.9f the twisting device is also shown in this-figure.

Figure 4y shows an alternative form of driving mechanism for the twisting spindle. The platform 10 is mounted on ball bearings 12 surrounding a spindle 43 which, has an enlarged portion 44 and is driven by means ofa whorl 45. The enlarged'portion 44 of the spindle 43 contains horizontal passages 46 leadingvto the flyers'27, 27', which are mounted on lan annular ring 47 forming art of the enlarged portion 44. Dispose at spindles 48vcarrying rollers 49 contained in recesses 50 in the enlarged portion 43. The

tively. 1 vThe flange 51 engages with an annular depending race 53 rigidly fixed to the platform- 10. The lower flange 52 engages with a similar annular race 5,5 carried by the frame 56 of the machine. Since the flanges V51, 52 are ofthe same size, the races 53, 55

are ,frictionally geared together, so that the upper race 53 is caused to remain stationary. 115

As a result, the platform 10 of the bobbin 6 which isvcarried thereon, is caused to .be yheld stationary while the spindle 43 and the flyers 27, 27" rotate, to produce the same jeffect asfthat described with reference to .Figures 1-3. A l

I claim and desire to secure by What Letters yPatent is: i i

1. 'Method' of twisting threads comprising drawing two threads from a single supply package', leading ltheml in opposite directions to .follow `independent looped paths round the package, and rotatingthe loops about the package as the threads are'drawnso.

2. Method according to cla1m 1, wherem Vrollers 49 are loosely mounted on the spindles lio points `at 90v` tothe passages 4 6 are short .100

the rate of twisting is higher than the rate of rotation of the loops about the package.

3. Method of twisting threads comprising drawing two threads from a singlethready of continuous lilaments contained on a supply package, leading the two threads away from the supply package so as to `follow separate looped paths round the package and rotating the loops about the package so as to twist each thread at a rate higher than the rate of rotation of the loops about the package.

4. Method of twisting threads comprising drawing two threads from a single untwisted thread of continuous filaments con,-

tained on a supply package, leading the two threads away from the supply package so as to follow sepa-rate looped paths round the package andv rotating the loops about the.

package so as to twist each thread at a rate higher than the rate of rotation of the loops about the package.

In testimony whereof I have hereunto subscribed my name.

WILLIAM POOL. 

